Trying to replace a 50a50473 with a 50a55843 and nothing is working

50a50 473 Replacement. Trying to replace a 50a50473 with a 50a55843 and nothing is working WR Upgraded Furnace Control Board Fits Trane White Rodgers 50A50-473 50A50-471 This item: Furnace Control Board Fits 50A50-473 50A50-471,Replacement for Trane OEM

Rodgers 50a50-473 control board is flashing twice which indicates"system lock out(no flame) check line polarity" 50A50-473 50A50-471 - White Rodgers Control Circuit Board Replaces Trane American Standard

50A50473 Replacement Household Furnace Control Circuit Boards

50A50-473 - Replacement Household Furnace Control Circuit Boards - Amazon.com 50A50-473 - Replacement Household Furnace Control Circuit Boards - Amazon.com + OEM 47-22861-01 Furnace Limit Switch L350 Roll Out Switch Compatible with Rheem Limit Switch 47-22861-01.

D330930P01 Furnace Control Board 50A50473 cracked case / worn labels. 50A50-473 50A50-474 50A50-475 50A50-571 50A55-143 50A55-241 50A55-245 50A55-250 50A55-285 50A55-286 50A55-288 50A55-289 50A55-3797. The Board # is CNT03797 and the White Rodgers part # is 50A55-486

White Rodgers 50A50473, D330930P01 Furnace Control Board Repair HVAC. Replacement Circuit Board comes with a new style white protective cover and several wires to extend existing wires if you need them White-Rodgers, Trane 24V, Integrated HSI Control Board Replacement • OEM Upgraded Trane Ignition Control Board